Please help
Find the GCF of the following monomials.

-50 m4n7 and 40 m2n10

Need to increase the numbers of customers i talk to daily by 20% how many customers do i need to talk to if i talk to a average of 8 customers per hour during an 8 hour shift

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m

Use sigma notation to represent the following series for 9 terms.